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Reading in a file of bytes.

Posted on 1998-06-25
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Last Modified: 2010-04-04
I am trying to find a way of reading a file of bytes straight into a structure. Currently i have it reading in one byte at a time into an array and it is much too slow! I am using Delphi 3 if this makes any difference :)
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Question by:pootlecat
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BlackMan earned 100 total points
ID: 1355636
One (fast) method is using BlockRead procedure. This allows you to specify how many bytes you want to read at a time.
There is a good example in the Helpfile.
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Expert Comment

by:vladika
ID: 1355637
Use TFileStream and its methods Read, Write, ReadBuffer, WriteBuffer

for Example

procedure Example;
type TMyStructure = record
   T1, T2, T3: Word;
  end;
var MyStructure: TMyStructure;
    FileStream: TFileStream;
begin
  FileStream := TFileStream.Create('c:\temp\myfile.dat', fmOpenRead);
  try
    while FileStream.Position < FileStream.Size do { while not end of file }
    begin
      FileStream.ReadBuffer(MyStructure, SizeOf(TMyStructure)); { read MyStructure }
      { process MyStructure }
    end;
  finally
    FileStream.Free;
  end;
end;

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Author Comment

by:pootlecat
ID: 1355638
Thanks for the example :) It's working great!
The help files on this version are a terrible mess and i couldn't find an example there.
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Author Comment

by:pootlecat
ID: 1355639
Thanks for the example :) It's working great!
The help files on this version are a terrible mess and i couldn't find an example there.
0
 
LVL 3

Expert Comment

by:vladika
ID: 1355640
Where is my points for example? :)
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Author Comment

by:pootlecat
ID: 1355641
Um tricky - you can have some points with pleasure but how do i do that lol?
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More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

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